Minigun - Why I needed the motor

Joined
Feb 1, 2003
Messages
1,221
I posted a message last week asking for advice on a small motor...

This is why:

http://pg.photos.yahoo.com/ph/grim_don/detail?.dir=/c84b&.dnm=3bfcre2.jpg
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http://pg.photos.yahoo.com/ph/grim_don/detail?.dir=/c84b&.dnm=ae23re2.jpg
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If the pics don't load in the post, click the link. I've "shared" the photos, so anyone should be able to see 'em.

I've made a minigun for my 8 year old son (and for me!) :D. I made the barrels out of PVC and wood, and the main body out of wood. Had an old joystick laying around unused which is the firing handle. I knew it would be too heavy for my son, so we grabbed the sholderstrap off the non-working weedeater.

It's done as far as "show", but now the real fun begins... I'd like to make it so the barrels spin when he depresses one of the joystick buttons. The center barrel of the gun goes all the way to the back end of the body. I was going to mount a cordless drill inside (with a cutout to replace the battery pack), and use a vacuum cleaner belt around the barrel to turn. Got out a Granger catalog at work and found out I can get ballbearing assemblies; that should help with the friction. They also have motors and motor mounts, but I'm not sure about battery-operated. I'm concerned that the cheapest cordless drills won't have the torque needed to turn the barrels. They won't have to spin at real minigun speeds, but the quicker the better.

One thing I did was to drill a hole in the main body behind the top barrel... When I add a light (hopefully run off the same motor), the top barrel will 'flash' as if a bullet had come out! My son was worried about the police seeing him while he was playing with it in the front yard (I told him most 8 year old's DON'T have play-min-guns, so he'd be safe, but he was still leery, so we got some PVC caps to paint orange and put on the ends of the barrels.

We still need to attach the shoulder strap, but I'd just got it painted (it'll need another coat or two), but I was too excited and had to share. Next, were going to work on a backpack (for the ammo) and a belt to connect the two. My son's already decided that we need to make a 'flamethrower" next. (I'll need chemical help with that one, as I'd like it to shoot completely hamrless white smoke when were done(don't post on that now, as that's a couple weeks/months in the future))

Edit to add this link which shows the pictures directly: http://www.comicboards.com/community/view.php?trd=060719021003
 
Can you adopt me? I'll call ya Dad!:D That is SERIOUSLY WAY TOO COOL!:thumbup:
 
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www.meci.com



Look under electromechanical parts for motors. Avoid "stepper" and "servo" motors and also multi-phase motors; these are a lot more complicated to deal with and would require some driver circuitry.

Look for a simple DC motor that runs off of a practical battery voltage. 4 D-cell batteries gives six volts. You might look for a six-volt motor. Generally, it's not good to run a motor much above its rated voltage. Go to far below, and it won't start, especially under load. But, a volt or two below will just reduce speed and torque.
 
I suppose many contemporary parents would be aghast at this project. I would have given a couple of eye-teeth for one when I was a kid!
 
I suggest a couple of enhancements:

- speaker + plkayback with some pre recorded mini gun sound effects ( likely downloadable from the net)

- Cannister of co2 wiht piping out the barell for some realistic smoke effects.
 
DaveH said:
I suggest a couple of enhancements:

- speaker + plkayback with some pre recorded mini gun sound effects ( likely downloadable from the net)

- Cannister of co2 wiht piping out the barell for some realistic smoke effects.

I LOVE the Co2 idea!!! Since I already have the hole for the light to go through, that "should" be easy to add on. THANKS!

I'm hoping the drill noise will carry through and provide the highpitched whine that the real one's sound like. If need be, I can cut a hole and place some speaker fabric over it.
 
There is a story, I have no idea of the truth of it, of a guy who bought an old C-47 from the Air Force, went to the airfield to pick it up, and found that it was an AC-47 Puff the Magic Dragon gunship, complete with 7.62 mini-guns. So the story goes, he fueled it up, showed the paper work, and took off for parts unknown with it.

Now, wouldn't one of those be a fun toy if you could afford it?:D
 
I remember watching a 60-minutes, I think, some years ago (it was a show about government waste and stupidity) where a scrap-iron guy bought a uranium enricher from the government. It was complete and totally operational, but had been sold as part of a bulk lot. The guy was able to get the assembly and operational instructions through the "Freedom of information act." He got suspicious about what he had when he started getting offers up into the millions for this "scrap metal" that he bought for less than a thousand bucks. He was upset when the government took the stuff back without paying him for it- sighting National Security of course. That's when he called the media. The government people were not happy to say the least.

I thought it was funny, in an oh my god kinda way!

Nice model, though!
 
mwerner said:
I suppose many contemporary parents would be aghast at this project. I would have given a couple of eye-teeth for one when I was a kid!


Yes, but what they would miss, and what is MOST significant in this whole thing, is that father and son BUILT this thing themselves and that they built it TOGETHER.
 
Gollnick said:
Yes, but what they would miss, and what is MOST significant in this whole thing, is that father and son BUILT this thing themselves and that they built it TOGETHER.

We sure did! I'd forgotten that we were going to get started on it, and started out to the garage to do some cleaning. My son asked if I was going to work on the gun. "oh, yeah, I knew there was something..." I thanked him for reminding me. I told him that it had skipped my mind and that I was planning on doing some cleaning.

He asked what I wanted and HE DID THE CLEANING while I was working on the gun. He even got up early the next day, to finish up (Mom was home with him). He was more than happy to help hold something that needed cut, and to offer his opinion if/when I told him of an idea/strategy. I've made it a point to ask his opinion since he was old enough to talk, then listen seriously and talk possibilities with him. He's only 8, but sometimes he stuns me with the things he comes up with, things that I didn't even think of.

He's already downloading pics off the net for the flamethrower. (We played Serious Sam, and these weapons were used heavily in the game) While I was working on the gun, he took an extra piece of PVC and painted it, then taped thread to one end to make a "sniper" scope for the old bb gun that doesn't work anymore. Another progect is to put a bipon on the front of that to make it a more realistic sniper rifle.Again, a project for both of us to work on together.

I'm already looking forward to the next gun/knife show... He'll be wearing his Terminator glasses as we walk around with the Mini! :D
 
Good on ya Grim, really neat projects. Glad to see a father and son spending time together:thumbup: :thumbup:
 
LOL, i just bought a slingshot for my two oldest daughters ( 9 and 8) :D
The only reason i could find was the fact that my dad didn't want me to have a slingshot.;)
 
Hey Guys...

I think this is some pretty cool stuff..
We(son and I) experienced the real things at Knobb Creek this spring...
And I can honestly say,, it's one of the coolest things I've seen...

Good on you for building one with your boy!!

Very cool..

ttyle

Eric....
 
Hey Mongo!

IIRC, you've come to KC for the big Gun/Knife show before... It's happening this weekend and my son and I will be there on Saturday WITH the gun! :D We finished up the orange end caps tonight and got quite a ways on the backpack/ammo holder. We've got the sholder strap attached, but it's 8-year-old boy sized, so no one else will be able to squeen in to it.
We won't have the motor/drill installed for a couple weeks yet. We going, to show it off, and to try and get some inert ammo, to hokk to the backpack and the gun.

Give a shout if ya see us!
 
Ever seen this ?
bb134.jpg

Its a BB gun
Description: 1/1 scale M-134 BB firing Minigun
Propellant: Co2 Or High Pressure Air Up To 150Psi
Ammo: 6mm .30 to .90gram Metal BB's (You can shoot plastic BB's if you wish)
Magazine: 1700 Rd Internal With Optional Power Assist
Construction: Body, All Metal With Plastic Rear Handle
Power Supply: 10.8 12.0 or 14.2 Volt Ni-Cad Power Pack
Velocity: +400fps with .30gram metal 6mm BB's
Manufacturer: Pipers Precision Products In Lampasas Texas
 
TBAUGH7 said:
Ever seen this ?


Yeah, yeah... but it's not hand-made by Dad!

All that teaches is how to spend money. Mr. Grim/Don, on the other hand, has taught lessons that will last a lifetime. Some of them are in woodworking, but a lot of them are in other things.
 
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